Abstract
In this work we revisit power law, , inflation to find the deviations from inflation allowed by current cosmic microwave background (CMB) and large-scale structure (LSS) observations. We compute the power spectra for scalar and tensor perturbations numerically and perform Markov chain Monte Carlo analysis to put constraints on parameters and from Planck-2018, BICEP3 and other LSS observations. We consider general reheating scenario and also vary the number of -foldings during inflation, , along with the other parameters. We find , and with 95% C.L. This indicates that the current observations allow deviation from Starobinsky inflation. The scalar spectral index, , and tensor-to-scalar ratio, , derived from these parameters, are consistent with the Planck and BICEP3 observations.
- Received 30 May 2023
- Accepted 14 November 2023
DOI:https://doi.org/10.1103/PhysRevD.108.123505
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